The following treatment modalities are generally used for periapical inflammation in children: 1. For acute periapical inflammation in milk teeth, emergency treatment measures are usually required. First, establish a drainage channel for the pulp chamber and use a fast and sharp turbine drill to open the pulp and remove infected necrotic material from the pulp chamber and root canal, while opening the pulp chamber to allow drainage of inflammatory exudate or pus through the root canal. After pulp opening and cleaning, tincture of iodine cotton balls are placed in the pulp chamber to avoid food blockage of the pulp chamber, and the inflammation subsides after several days of drainage through the pulp chamber, and then conventional treatment is performed; the second step is incision and drainage to form submucosal abscesses and establish drainage channels for the pulp chamber in addition to local incision and drainage of abscesses in the oral cavity; the third step is to perform systemic treatment with antibacterial drugs, usually by oral or injectable route, giving The third step is systemic treatment with antibacterial drugs, usually by oral or injectable route, giving antibiotics to accelerate the inflammation; 2, root canal therapy: through the root canal preparation and drug disinfection to remove the infected material on the periapical tissue of the bad stimulation, and the use of absorbable filling material to fill the root canal, to achieve the purpose of periapical disease healing. This is currently the most effective clinical treatment for periapical disease of milk teeth.